The genomic effects of dieldrin in the hypothalamus of largemouth bass
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ABSTRACT:
ORGANISM(S): Micropterus salmoides
SUBMITTER: Christopher Martyniuk
PROVIDER: E-GEOD-16402 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:This study examines the genomic effects of dieldrin in the hypothalamus of largemouth bass. Dieldrin is an insectide and organic pollutant.
2009-06-06 | GSE16402 | GEO
Project description:In this study, both male and female sexually regressed largemouth bass (Micropterus salmoides) (LMB) were fed a nominal concentration of 3.0 mg dieldrin/kg in feed for 60 days. A third group of male LMB was fed both 3.0 mg dieldrin/kg dieldrin and 0.7 mg E2/kg in feed. E2 was used as a model compound to elicit estrogenic effects via ER signaling. There were four samples analyzed for 1) control males 2) control females 3) males fed 3 mg/kg dieldrin 4) females fed 3.0 mg/kg dieldrin, and 5) males fed 3.0 mg/kg dieldrin + 0.7 mg/kg E2. There was a total of 20 microarrays and sample processed.
2011-04-17 | E-GEOD-27963 | biostudies-arrayexpress
Project description:In this study, both male and female sexually regressed largemouth bass (Micropterus salmoides) (LMB) were fed a nominal concentration of 3.0 mg dieldrin/kg in feed for 60 days. A third group of male LMB was fed both 3.0 mg dieldrin/kg dieldrin and 0.7 mg E2/kg in feed. E2 was used as a model compound to elicit estrogenic effects via ER signaling.
2011-04-17 | GSE27963 | GEO
Project description:Female largemouth bass were injected with 10mg/kg dieldrin and sacrificed after 7 days. Hypothalami were dissected and total RNA extracted for microarray analysis. Exposure to dieldrin induces neurotoxic effects in the vertebrate CNS and disrupts reproductive processes in teleost fish. Reproductive impairment observed in fish is likely the result of multiple mechanisms of action along the hypothalamic-pituitary-gonadal axis. To better elucidate the mode of action of dieldrin in the hypothalamus, we measured neurotransmitter levels and examined the transcriptomic response of female largemouth bass (LMB) to an acute treatment of dieldrin. Female LMB were injected with either vehicle or 10 mg/kg dieldrin and sacrificed after seven days. The neurotransmitter γ-aminobutyric acid was significantly elevated by approximately 25-30% in the hypothalamus and cerebellum but there was no change in dopamine levels in the hypothalamus, telencephalon, or cerebellum. We identified 270 transcripts (p<0.001) as being differentially regulated by dieldrin. Functional enrichment analysis identified transcription, DNA repair, ubiquitin pathway, cell communication, and phosphorylation as biological processes over-represented in the microarray analysis. Pathway analysis identified DNA damage, inflammation, regeneration, and Alzheimerâs disease as major cell processes and diseases affected by dieldrin. Using multiple bioinformatics approaches, this study demonstrates that the teleostean hypothalamus is a target for dieldrin-induced neurotoxicity and provides mechanistic evidence that dieldrin activates similar cell pathways and biological processes that are involved in the etiology of human neurological disorders. Key words: ubiquitin-proteasome pathway, mutagenicity, neurodegeneration, apoptosis, DNA damage Largemouth bass injected with single i.p. with 10 mg/kg diedrin; sacrificed 7 days later, hypothalamic tissue studied
2010-06-19 | E-GEOD-12698 | biostudies-arrayexpress
Project description:Female largemouth bass were injected with 10mg/kg dieldrin and sacrificed after 7 days. Hypothalami were dissected and total RNA extracted for microarray analysis. Exposure to dieldrin induces neurotoxic effects in the vertebrate CNS and disrupts reproductive processes in teleost fish. Reproductive impairment observed in fish is likely the result of multiple mechanisms of action along the hypothalamic-pituitary-gonadal axis. To better elucidate the mode of action of dieldrin in the hypothalamus, we measured neurotransmitter levels and examined the transcriptomic response of female largemouth bass (LMB) to an acute treatment of dieldrin. Female LMB were injected with either vehicle or 10 mg/kg dieldrin and sacrificed after seven days. The neurotransmitter γ-aminobutyric acid was significantly elevated by approximately 25-30% in the hypothalamus and cerebellum but there was no change in dopamine levels in the hypothalamus, telencephalon, or cerebellum. We identified 270 transcripts (p<0.001) as being differentially regulated by dieldrin. Functional enrichment analysis identified transcription, DNA repair, ubiquitin pathway, cell communication, and phosphorylation as biological processes over-represented in the microarray analysis. Pathway analysis identified DNA damage, inflammation, regeneration, and Alzheimer’s disease as major cell processes and diseases affected by dieldrin. Using multiple bioinformatics approaches, this study demonstrates that the teleostean hypothalamus is a target for dieldrin-induced neurotoxicity and provides mechanistic evidence that dieldrin activates similar cell pathways and biological processes that are involved in the etiology of human neurological disorders. Key words: ubiquitin-proteasome pathway, mutagenicity, neurodegeneration, apoptosis, DNA damage
2008-09-08 | GSE12698 | GEO
Project description:A novel custom microarray for largemouth bass (Micropterus salmoides) was designed from sequences obtained from a normalized cDNA library using the 454 Life Sciences GS-20 pyrosequencer. The GS-20 yielded in excess of 58 million bases of high-quality sequence. The sequence information was combined with 2,616 reads obtained by traditional suppressive subtractive hybridizations to derive a total of 31,391 unique sequences. Annotation and coding sequences were predicted for these transcripts where possible. 16,350 annotated transcripts were selected as target sequences for the design of the custom largemouth bass oligonucleotide microarray. The microarray was validated by examining the transcriptomic response in male largemouth bass exposed to 17 -oestradiol. Transcriptomic responses were assessed in liver and gonad, and indicated gene expression profiles typical of exposure to oestradiol. The results demonstrate the potential to rapidly create the tools necessary to assess large scale transcriptional responses in non-model species, paving the way for expanded impact of toxicogenomics in ecotoxicology. Keywords: E2 exposure, array validation This experiment tested two organs - liver and gonad from either E2-exposed or control fish, 4 fish (biological replicates) per treament (control and E2).
2010-05-25 | E-GEOD-10693 | biostudies-arrayexpress
Project description:A novel custom microarray for largemouth bass (Micropterus salmoides) was designed from sequences obtained from a normalized cDNA library using the 454 Life Sciences GS-20 pyrosequencer. The GS-20 yielded in excess of 58 million bases of high-quality sequence. The sequence information was combined with 2,616 reads obtained by traditional suppressive subtractive hybridizations to derive a total of 31,391 unique sequences. Annotation and coding sequences were predicted for these transcripts where possible. 16,350 annotated transcripts were selected as target sequences for the design of the custom largemouth bass oligonucleotide microarray. The microarray was validated by examining the transcriptomic response in male largemouth bass exposed to 17 -oestradiol. Transcriptomic responses were assessed in liver and gonad, and indicated gene expression profiles typical of exposure to oestradiol. The results demonstrate the potential to rapidly create the tools necessary to assess large scale transcriptional responses in non-model species, paving the way for expanded impact of toxicogenomics in ecotoxicology. Keywords: E2 exposure, array validation
2008-08-01 | GSE10693 | GEO
Project description:This SuperSeries is composed of the following subset Series: GSE38738: High contaminant loads in Lake Apopka mesocosms affect the ovarian transcriptome in largemouth bass [April] GSE38773: High contaminant loads in Lake Apopka mesocosms affect the ovarian transcriptome in largemouth bass [January] Refer to individual Series
2012-08-31 | E-GEOD-38774 | biostudies-arrayexpress
Project description:This SuperSeries is composed of the following subset Series: GSE38456: Characterizing gene regulatory networks in the brain of largemouth bass inhabiting rivers containing high levels of methyl-mercury (lab study) GSE38458: Characterizing gene regulatory networks in the brain of largemouth bass inhabiting rivers containing high levels of methyl-mercury (field study) Refer to individual Series
2012-08-31 | E-GEOD-38474 | biostudies-arrayexpress
Project description:We sequenced mRNA from 9 liver samples of juvenile largemouth bass (Micropterus salmoides) taken from different lead concentration exposure treatment fish and control fish to investigate the transcriptome and comparative expression profiles of largemouth bass liver undergoing lead exposure.
2019-01-12 | GSE124986 | GEO